KMID : 1007520130220020477
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Food Science and Biotechnology 2013 Volume.22 No. 2 p.477 ~ p.483
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Establishment of Quality Criteria and Estimate of Shelf-life for Yogurt Beverage and Stirred-type Yogurt in Korea
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Yoon Su-Jin
Park Jung-Min Gu Ja-Gyeong Lee Jeong-Soo An Ji-Hui Kim Sae-Hun Park Jae-Woo Song Sung-Ok Wee Sung-Hwan Moon Kyung-Hwan Yang Cheul-Young Kim Jin-Man
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Abstract
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This study was conducted to estimate the shelflife of yogurt beverage and stirred-type yogurt. Samples of yogurt beverage and stirred-type yogurt were stored at 10, 15, and 25oC during 25-day storage, and quality changes were monitored. The quality limit for the sensory evaluation was set to 5 points on a 9-point hedonic scale. The legal limits for other quality criteria were established based on the ¡®Process Criteria and Ingredient Standards of Livestock Products¡¯ issued by the Animal, Plant and Fisheries Quarantine and Inspection Agency (QIA). Regression equations were used to calculate the non-legal quality limits between sensory evaluation (x) and non-legal quality criteria (y). Non-legal quality criteria were excluded from quality criteria used to establish shelf-life which the correlation coefficient (R2) of the regression equation was less than 0.9. The estimated shelf-life was defined as the date when the earliest date among all date of quality limit. This study indicated that the shelf-life of each sample at 10, 15, and 25oC were as follows: 19, 14, and 12 days for yogurt beverage, and 17, 16, and 12 days for stirred-type yogurt, respectively.
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KEYWORD
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shelf-life, quality limit, quality criteria, yogurt beverage, stirred-type yogurt
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